1. NAME AND TITLE
RIPPLE: A Computer Program for Incompressible Fluid Dynamics with Free Surfaces.
Los Alamos National Laboratory through the Energy Science and Technology Software Center, Oak Ridge, Tennessee, USA.
3. CODING LANGUAGE AND COMPUTER
FORTRAN; CRAY X-MP (P00571CYXMP00).
4. NATURE OF PROBLEM SOLVED
RIPPLE is a two-dimensional, transient, free surface incompressible fluid dynamics program. It allows multiple free surfaces with surface tension and wall adhesion forces and has a partial cell treatment which allows curved boundaries and interior obstacles.
5. METHOD OF SOLUTION
RIPPLE simulates incompressible flows with free surfaces using the volume-of-fluid (VOF) algorithm. This technique is based on the use of donor-acceptor differencing to track the free surface across an Eulerian grid. The complete Navier-Stokes equations in primitive variables for an incompressible fluid are solved by finite differences with surface tension and wall adhesion included. Optionally the pressure equation can be solved by a conjugate residual method rather than the successive overrelaxation (SOR) method.
RIPPLE is highly structured so that individual components may be easily modified to fit specific problem requirements or to accept subsequent code upgrades.
6. RESTRICTIONS OR LIMITATIONS
RIPPLE contains calls to several system-dependent plotting routines and a time limit routine. These are not included, and users must supply their own equivalent routines. RIPPLE can run many problems without modification, but a specific application may require changes to the logic for special inflow or outflow ports, complicated geometries, or unusual conditions. These are accomplished by using the UPDATE utility.
7. TYPICAL RUNNING TIME
8. COMPUTER HARDWARE REQUIREMENTS
3 units in addition to the standard input/output units. 144,000 words of memory are required for execution on a Cray X-MP.
9. COMPUTER SOFTWARE REQUIREMENTS
A FORTRAN compiler is required.
D.B. Kothe et al.: “RIPPLE: A Computer Program for Incompressible Flows with Free Surfaces,” LA-12007-MS; UC-000 (April 1991).
11. CONTENTS OF CODE PACKAGE
The package is transmitted on a CD that includes the referenced document above, source code and sample problems.
12. DATE OF ABSTRACT
KEYWORDS: FLUID DYNAMICS, SURFACE TENSION, FLUID FLOW, INCOMPRESSIBLE FLOW